Automatic calibration device suitable for laser range finder

Abstract

The utility model provides an automatic calibration device suitable for a laser range finder, relates to the technical field of measurement, and is used for detecting the precision and the stability of the laser range finder. The device is composed of a calibration table main body frame, a range finder positioning table and a target, the device is hollow and free of a bottom plate, and a screw rod module, a connecting plate and a reinforcing rib are arranged; the optical axis, the optical axis positioner, the optical axis fixing seat and the positioning bedplate on the range finder calibration table are matched with one another, so that a plurality of to-be-calibrated laser range finders are quickly fixed, and the to-be-calibrated laser range finders are prevented from displacement during calibration; the displacement of the target on the moving track is controlled by a control display screen, a control button and an internal screw rod module on the calibration table main body frame, so that manual intervention is reduced; according to the device, multiple instruments can be calibrated at a time, the range finder positioning table is convenient to mount and quick to dismount, and the calibration efficiency can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of measurement, in particular to an automatic calibration device suitable for a laser rangefinder. Background Art

[0002] A laser rangefinder uses the principle of laser ranging to measure distance. It emits a laser beam at a target and measures the time between the laser's emission and its reflection from the target's surface. Due to its fast measurement speed, high accuracy, low cost, and compact size, laser rangefinders are widely used for distance measurement in engineering, pipeline surveying, geological and mineral exploration, and other fields.

[0003] Laser rangefinders require calibration before use to test their accuracy and stability. Currently, existing laser rangefinder calibration devices still have shortcomings. For example, the calibration device disclosed in utility model patent CN217820842U uses scale lines on the calibration table, requiring manual adjustment of the target position, which introduces human error and leaves room for improvement in automation. Similarly, the calibration device disclosed in utility model patent CN221899329U can calibrate only a limited number of static levels at once, leaving room for improvement in detection efficiency. Summary of the Invention

[0004] The purpose of the utility model is to solve the shortcomings of the above-mentioned calibration method and device, and to provide an automatic calibration device suitable for laser rangefinders. The device drives the ball screw to rotate through an electric motor, driving the target fixed on the displacement platform to move along the linear guide rail according to the set distance, thereby reducing manual intervention; the rangefinder positioning platform is equipped with multiple layers of positioning plates on the optical axis, and each layer of positioning plates can hold 1 to 3 laser rangefinders, so that multiple instruments can be calibrated at one time, and the optical axis locator is easy to install and quickly disassembled, which can improve the calibration efficiency.

[0005] The implementation of the present utility model is composed of the following technical solutions.

[0006] An automatic calibration device for a laser rangefinder, comprising a calibration platform main frame, a rangefinder positioning platform and a target, for detecting the accuracy and stability of the laser rangefinder, characterized in that: a rangefinder positioning platform is provided at one end of the calibration platform main frame, and a target is provided at the other end; the interior is hollow without a bottom plate, and a screw module, a connecting plate and a reinforcing rib are arranged; the rangefinder positioning platform is provided with a positioning platform plate, which can be fixed to an appropriate position on the optical axis by an optical axis fixing seat; the laser rangefinder is placed on the positioning platform plate, with the fixing hole aligned with the limit slot on the positioning platform plate, and fixed with an optical axis locator in combination with screws and nuts; the working status of the target is displayed on a control display screen on the calibration platform main frame , control buttons and screw modules are set; the control display screen, control buttons and the circuit of the screw module are connected, and through an external power supply, the motor of the screw module drives the ball screw to rotate under the setting control, driving the target fixed on the displacement platform to move along the linear guide rail, and the linear guide rail is parallel to the moving track on the main frame of the calibration platform, thereby realizing the control of the target to move back and forth on the moving track; the displacement display screen indicates the moving state and distance of the target; the connecting plate is fixed to the inside of the main frame of the calibration platform by screw and nut assembly and welding reinforcement ribs on both sides, and reinforcement ribs are welded at intervals at non-connected parts inside the main frame of the calibration platform to reinforce the main frame of the calibration platform.

[0007] The advantages of the utility model are that the device drives the ball screw to rotate through an electric motor, driving the target fixed on the displacement platform to move along the linear guide rail according to the set distance, thereby reducing manual intervention; the rangefinder positioning platform is equipped with a multi-layer positioning table on the optical axis, which can calibrate multiple instruments at one time, and is convenient and quick to install and disassemble, thereby improving calibration efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a three-dimensional view of the present invention.

[0009] Figure 2 This is a three-dimensional view of the positioning platform of the rangefinder of the present utility model.

[0010] Figure 3 This is a three-dimensional view of the assembly of the target and the ball screw of the utility model.

[0011] Figure 4 It is a three-dimensional view of the internal connection of the utility model. DETAILED DESCRIPTION

[0012] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0013] Figures 1 to 4 The marks (1) to (19) in the figure are: calibration platform main frame (1), target (2), moving track (3), handling hole (4), displacement display screen (5), control display screen (6), control button (7), rangefinder positioning platform (8), optical axis (9), optical axis positioner (10), optical axis fixing seat (11), laser rangefinder (12), positioning platform (13), limit groove (14), fixing hole (15), screw module (16), ball screw (16-1), linear guide (16-2), motor (16-3), displacement platform (16-4), connecting plate (17), reinforcing rib (18), connecting plate fixing hole (19).

[0014] The main frame (1) of the calibration platform comprises: a target (2), a movable track (3), a transport hand-held hole (4), a displacement display screen (5), a control display (6), a control button (7), a rangefinder positioning platform (8), a ball screw (16), a connecting plate (17), a reinforcing rib (18), and a connecting plate fixing hole (19).

[0015] The rangefinder positioning platform (8) comprises: an optical axis (9), an optical axis positioner (10), an optical axis fixing seat (11), a laser rangefinder (12), a positioning platform (13), a limiting groove (14), and a fixing hole (15).

[0016] The screw module (16) comprises: a ball screw (16-1), a linear guide rail (16-2), a motor (16-3), and a displacement platform (16-4).

[0017] Example: In a specific implementation process, the device works as follows.

[0018] A rangefinder positioning platform (8) is provided at one end of the calibration platform main frame (1), a target (2) is provided at the other end, and a carrying hand-held hole (4) for carrying the device is provided at both ends. A displacement display (5), a control display (6) and a control button (7) for displaying and controlling the moving state of the target (2) are provided on the side panel; the interior is hollow without a bottom plate, and a screw module (16), a connecting plate (17) and a reinforcing rib (18) are arranged. The screw module (16) and the target (2) outside the calibration platform main frame (1) are assembled and fixed by screws and nuts.

[0019] The rangefinder positioning platform (8) is provided with an optical axis (9), an optical axis positioner (10), an optical axis fixing seat (11), a laser rangefinder (12) and a positioning platform (13). The rangefinder positioning platform (8) is supported by four optical axes (9) and is fixed to a panel of a calibration platform main frame (1) with screws and nuts; the positioning platform (13) has limit slots (14) on the upper and lower, front and back four sides, and the optical axis fixing seat is aligned with the limit slots (14) on the front and back two sides, and the positioning platform (13) can be fixed to an appropriate position of the optical axis (9) with screws and nuts; since the optical axis (9) has a certain length, the positioning platform (13) can be provided with multiple layers, and the height of each layer can be adjusted to a height suitable for the laser rangefinder (12), so as to install multiple laser rangefinders (12) and perform calibration at the same time.

[0020] The laser rangefinder (12) is placed on the positioning table (13), and a fixing hole (15) is provided at the bottom. The fixing hole (15) is aligned with the limiting groove (14) on the positioning table (13) and fixed with a screw nut to limit the front, back, left and right movement of the laser rangefinder (12); the optical axis positioner (10) is installed on the optical axis (9), and can move up and down along the optical axis (9) in a normal state, and can be fixed at a certain position of the optical axis (9) in a locked state. After the laser rangefinder (12) is fixed on the positioning table (13), the optical axis positioner (10) is moved to a position where the laser rangefinder (12) can be pressed and locked, thereby limiting its up and down movement; the positioning plate (13) and the optical axis positioner (10) are used together to firmly fix the laser rangefinder (12), ensuring that the laser rangefinder (12) does not move during calibration. The target (2) is used as the target object, and the laser emitted by the laser rangefinder (12) hits its surface to measure the distance between the two.

[0021] The working state of the target (2) is set by the control display (6), the control button (7) and the screw module (16). The control display screen (6) and the screw module (16) are connected through a circuit, which belongs to the existing technology. The pulse value and the working mode are set to control the operation of the motor (16-3), drive the ball screw (16-1) to rotate, and drive the target (2) fixed on the displacement platform (16-4) to move along the linear guide rail (16-2). The linear guide rail (16-2) is parallel to the moving track (3) on the main frame (1) of the calibration platform, thereby controlling the target (2) to move forward, stop and retreat on the moving track (3), and controlling the distance between it and the laser rangefinder (12) placed on the rangefinder positioning platform (8); there are 4 control buttons (7), which are "power", "start", "pause" and "return to zero" from left to right, and cooperate with the control display screen (6) to control the working status of the target (2); the displacement display screen (5) is used to indicate the forward and backward movement distance of the target (2), which can be compared with the value measured by the laser rangefinder (12).

[0022] The screw module (16) is fixed to the inside of the main frame (1) of the calibration platform by screw and nut assembly, and includes a ball screw (16-1), a linear guide (16-2), a motor (16-3) and a displacement platform (16-4). It belongs to the existing technology and uses the model 1605. Its circuit is connected to the displacement display screen (5), the control display screen (6) and the control button (7). The connection method of each electrical component is the existing technology. The working state of the motor (16-3) is controlled by the control display screen (6) and the control button (7); the motor (16-3) receives the pulse value given by the control display screen (6) to control the rotation of the ball screw (16-1). For each rotation of the ball screw (16-1), the displacement platform (16-4) moves a distance of , then the ball screw (16-1) is driven to rotate After the circle, the moving distance of the displacement platform (16-4) for: .

[0023] The bottom of the target (2) is fixed on the displacement platform (16-4) by screws and nuts, so the moving distance of the target (2) is , whose value can be displayed on the displacement display (5).

[0024] The laser rangefinder (12) mounted on the rangefinder positioning platform (8) emits a laser beam to hit the surface of the target (2) as the target object, and measures the distance between the target (2). The moving distance of the target (2) driven by the screw module (16) is compared with the displacement change measured by the laser rangefinder (12), so as to realize the calibration of the laser rangefinder (12).

[0025] The main frame (1) of the calibration platform is a hollow structure with an open bottom and no cover. In order to reinforce the main frame (1) of the calibration platform and prevent it from deformation, reinforcing ribs (18) that match the cross-sectional shape of the main frame (1) of the calibration platform are welded at fixed intervals close to the inner wall at the non-connected parts of the calibration platform; at the connection parts of the main frame (1), a connecting plate (17) is installed close to the inner wall, and screws and nuts are assembled into the connecting plate fixing holes (19). The connecting plate (17) is fixed to the connection part, and reinforcing ribs (18) are welded close to both sides of the connecting plate (17) to strengthen the connection.

[0026] The advantages of the utility model are that the device drives the ball screw to rotate through an electric motor, driving the target fixed on the displacement platform to move along the linear guide rail according to the set distance, thereby reducing manual intervention; the rangefinder positioning platform is equipped with a multi-layer positioning table on the optical axis, which can calibrate multiple instruments at one time, and is convenient and quick to install and disassemble, thereby improving calibration efficiency.

Claims

1. An automatic calibration device for a laser rangefinder, comprising a calibration platform main frame (1), a rangefinder positioning platform (8) and a target (2), for detecting the accuracy and stability of the laser rangefinder, characterized in that: The main frame (1) of the calibration platform is provided with a rangefinder positioning platform (8) at one end and a target (2) at the other end. The interior is hollow without a bottom plate and is provided with a screw module (16), a connecting plate (17) and a reinforcing rib (18); the rangefinder positioning platform (8) is provided with a positioning platform (13), which can be fixed to an appropriate position of the optical axis (9) by an optical axis fixing seat (11); the laser rangefinder (12) is placed on the positioning platform (13), and the fixing hole (15) is aligned with the limiting groove (14) on the positioning platform (13), and is fixed with an optical axis positioner (10) in combination with a screw nut; the working state of the target (2) is set by the control display screen (6), the control button (7) and the screw module (16) on the main frame (1) of the calibration platform; the control display screen (6), the control button (7) and the screw module (16) is connected to the circuit of the calibration platform. Through the external power supply, the motor (16-3) of the screw module (16) drives the ball screw (16-1) to rotate under the setting control, driving the target (2) fixed on the displacement platform (16-4) to move along the linear guide rail (16-2). The linear guide rail (16-2) is parallel to the moving track (3) on the calibration platform main frame (1), thereby realizing the control of the target (2) to move back and forth on the moving track (3); the displacement display screen (5) indicates the moving state and distance of the target (2); the connecting plate (17) is fixed to the inside of the calibration platform main frame (1) by screw and nut assembly and welding reinforcement ribs (18) on both sides; at the non-connected part inside the calibration platform main frame (1), reinforcement ribs (18) are welded at intervals to reinforce the calibration platform main frame (1).

2. The automatic calibration device for a laser rangefinder according to claim 1, characterized in that: The main frame (1) of the calibration platform comprises: a target (2), a movable track (3), a transport hand-held hole (4), a displacement display screen (5), a control display screen (6), a control button (7), a rangefinder positioning platform (8), a screw module (16), a connecting plate (17), a reinforcing rib (18), and a connecting plate fixing hole (19).

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